Abstract
We performed unconfined compression tests on 66 cylinders of Climax Stock quartz monzonite (CSQM), half of which had received a gamma ray dose of 9 ± 1 MGy (0.9 Grad) and half of which had not. We performed similar tests on 30 cylinders of Westerly granite. The experiment on CSQM was capable of detecting a 7% change in the unconfined strength level of 200 MPa. The experiment showed no statistically significant change. Null results were also found for the effect of gamma irradiation upon Young's modulus and Poisson's ratio in CSQM and for that upon the unconfined compressional strength of Westerly granite. We thus conclude that gamma irradiation has no effect on the strengths of either CSQM or Westerly granite.
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